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THE ASTROPHYSICAL JOURNAL CONTENTS OF VOLUME 557, PART 2 2001 AUGUST 10, NUMBER 1 EDITORIAL: ELECTRONIC SUPPLEMENTAL MATERIALS FOR THE ASTROPHYSICAL JOURNAL Robert C. Kennicutt, Jr. HIGH-RESOLUTION X-RAY AND ULTRAVIOLET SPECTROSCOPY OF THE COMPLEX INTRINSIC ABSORPTION IN NGC 4051 WITH CHANDRA AND THE HUBBLE SPACE TELESCOPE M. J. Collinge, W. N. Brandt, Shai Kaspi, D. Michael Crenshaw, Martin Elvis, Steven B. Kraemer, Christopher S. Reynolds, Rita M. Sambruna, & Beverley J. Wills ANOMALOUS X-RAY PULSARS AND SOFT GAMMA-RAY REPEATERS: SPECTRAL FITS AND THE MAGNETAR MODEL Rosalba Perna, Jeremy S. Heyl, Lars E. Hernquist, Adrienne M. Juett, & Deepto Chakrabarty PARTIALLY ABSORBED COMPTONIZATION SPECTRUM FROM THE NEARLY EDGE-ON SOURCE X1822—371 R. Iaria, T. Di Salvo, L. Burderi, & N. R. Robba STIS ECHELLE OBSERVATIONS OF THE INTRINSIC UV ABSORPTION IN THE SEYFERT 1 GALAXY NGC 3783 S. B. Kracmer, D. M. Crenshaw, & J. R Gabel A FAR-INFRARED STUDY OF THE CfA SEYFERT SAMPLE. I. THE DATA © A. M. Perez Garcia & J. M. Rodriguez Espinosa THE OBSCURING STARBURST OF NGC 6221 AND IMPLICATIONS FOR THE HARD X-RAY BACKGROUND N. A. Levenson, R. Cid Fernandes, Jr., K. A.W eaver, T. M. Heckman, & T. Storchi-Bergmann HYDRODYNAMIC SIMULATION OF THE COSMOLOGICAL X-RAY BACKGROUND Rupert A. C. Croft, Tiziana Di Matteo, Romeel Davé, Lars Hernquist, Neal Katz, Mark A. Fardal, & David H. Weinberg ON LOCAL APPROXIMATIONS TO THE NONLINEAR EVOLUTION OF LARGE-SCALE STRUCTURE © Martin Makler, Takeshi Kodama, & Mauricio O. Calvao COSMOLOGICAL DENSITY AND POWER SPECTRUM FROM PECULIAR VELOCITIES: NONLINEAR CORRECTIONS AND PRINCIPAL COMPONENT ANALYSIS L. Silberman, A. Dekel, A. Eldar, & I. Zehavi THE ENVIRONMENTAL DEPENDENCE OF THE INFRARED LUMINOSITY AND STELLAR MASS FUNCTIONS Michael L. Balogh, Daniel Christlein, Ann I. Zabludoff, & Dennis Zaritsky THE IMPLICATIONS OF THE NEW Z =0 STELLAR MODELS AND YIELDS ON THE FARLY METAL POLLUTION OF THE INTERGALACTIC MEDIUM C. Abia, I. Dominguez, O. Straniero, M. Limongi, A. Chieffi, & J. Isern INTERPRETING DEBRIS FROM SATELLITE DISRUPTION IN EXTERNAL GALAXIES Kathryn V. Johnston, Penny D. Sackett, & James S. Bullock THE SPATIAL DISTRIBUTION AND KINEMATICS OF STELLAR POPULATIONS IN E+A GALAXIES Stuart A. Norton, Karl Gebhardt, Ann I. Zabludoff, & Dennis Zaritsky A BACKWARDS APPROACH TO THE FORMATION OF DISK GALAXIES. I. STELLAR AND GAS CONTENT Ignacio Ferreras & Joseph Silk A CHANDRA OBSERVATION OF THE CIRCINUS GALAXY © David A. Smith & Andrew S. Wilson TRACING THE MASS DURING LOW-MASS STAR FORMATION. II. MODELING THE SUBMILLIMETER EMISSION FROM PREPROTOSTELLAR CORES Neal J. Evans II, Jonathan M. C. Rawlings, Yancy L. Shirley, & Lee G. Mundy MOLECULAR EXCITATION AND DIFFERENTIAL GAS-PHASE DEPLETIONS IN THE IC 5146 DARK CLOUD Edwin A. Bergin, David R. Ciardi, Charles J. Lada, Joao Alves, & Elizabeth A. Lada lil CONTENTS HYDROGEN RECOMBINATION LINES NEAR 327 MHz. III. PHYSICAL PROPERTIES AND ORIGIN OF THE LOW-DENSITY IONIZED GAS IN THE INNER GALAXY D. Anish Roshi & K. R. Anantharamaiah SUBMILLIMETER CO LINE EMISSION FROM ORION T. L. Wilson, D. Muders, C. Kramer, & C. Henkel MAGNETIC COLLIMATION IN PLANETARY NEBULAE T. A. Gardiner & A. Frank DEPARTURE FROM AXISYMMETRY IN PLANETARY NEBULAE Noam Soker & Saul Rappaport NON-LTE SYNTHETIC SPECTRAL FITS TO THE TYPE Ia SUPERNOVA 1994D IN NGC 4526 Eric J. Lentz, E. Baron, David Branch, & Peter H. Hauschildt CONSTRAINTS ON THE PROGENITORS OF TYPE Ia SUPERNOVAE AND IMPLICATIONS FOR THE COSMOLOGICAL EQUATION OF STATE Inma Dominguez, Peter Hoflich, & Oscar Straniero A BROWN DWARF COMPANION FOR THE ACCRETING MILLISECOND PULSAR SAX J1808.4—3658 Lars Bildsten & Deepto Chakrabarty THE STATISTICS OF RADIO PULSARS: A SPARK MODEL G. L. Fan, K. S. Cheng, & R. N. Manchester THE QUIESCENT EMISSION SPECTRUM OF CENTAURUS X-4 AND OTHER X-RAY TRANSIENTS CONTAINING NEUTRON STARS Kristen Menou & Jeffrey E. McClintock PULSATIONAL STABILITY OF g-MODES IN SLOWLY PULSATING B STARS Umin Lee LEAD, TIN, AND GERMANIUM IN THE SMALL MAGELLANIC CLOUD MAIN-SEQUENCE B STAR AV 304 Charles R. Proffitt, Craig J. Sansonetti, & Joseph Reader HIGH-BETA DISRUPTION IN THE SOLAR ATMOSPHERE Kiyoto Shibasaki ENERGY BALANCE IN THE FLARING SOLAR CORONA M. S. Wheatland & Yuri E. Litvinenko GENERATION OF ION CYCLOTRON WAVES IN CORONAL HOLES BY A GLOBAL RESONANT MAGNETOHYDRODYNAMIC MODE S. A. Markovskii SMALL FLUCTUATION OF CORONAL X-RAY INTENSITY AND A SIGNATURE OF NANOFLARES Yukio Katsukawa & Saku Tsuneta 1997 DECEMBER 12 HELICAL CORONAL MASS EJECTION. Il. DENSITY, ENERGY ESTIMATES, AND HYDRODYNAMICS A. Ciaravella, J. C. Raymond, F. Reale, L. Strachan, & G. Peres SPECTRAL DIAGNOSTICS OF CHROMOSPHERES—A SIGNATURE OF EMERGENT MAGNETIC FLUX K. S. Balasubramaniam THE CASE AGAINST COLD, DARK CHROMOSPHERES Wolfgang Kalkofen INVESTIGATION OF MASS FLOWS BENEATH A SUNSPOT BY TIME-DISTANCE HELIOSEISMOLOGY Junwei Zhao, Alexander G. Kosovichev, & Thomas L. Duvall, Jr. MULTILEVEL RADIATIVE TRANSFER WITH PARTIAL FREQUENCY REDISTRIBUTION H. Uitenbroek EFFICIENCY AND SPECTRUM OF INTERNAL GAMMA-RAY BURST SHOCKS D. Guetta, M. Spada, & E. Waxman THE NATURE OF THE EMISSION COMPONENTS IN THE QUASAR/NLS1 PG 12114143 A. Janiuk, B. Czerny, & G. M. Madejski USING GRAVITATIONAL LENSING TO STUDY H 1 CLOUDS AT HIGH REDSHIFT Tarun Deep Saini, Somnath Bharadwaj, & Shiv K. Sethi HYDRODYNAMIC SIMULATIONS OF JET- AND WIND-DRIVEN PROTOSTELLAR OUTFLOWS Chin-Fei Lee, James M. Stone, Eve C. Ostriker, &L ee G. Mundy CONTENTS A BALLISTIC BOW SHOCK MODEL FOR JET-DRIVEN PROTOSTELLAR OUTFLOW SHELLS Eve C. Ostriker, Chin-Fei Lee, James M. Stone, & Lee G. Mundy TURBULENT FLOWS WITHIN SELF-GRAVITATING MAGNETIZED MOLECULAR CLOUDS D. S. Balsara, R. M. Crutcher, & A. Pouquet THREE-DIMENSIONAL SIMULATIONS OF THE PARKER INSTABILITY IN A UNIFORMLY ROTATING DISK © Jongsoo Kim, Dongsu Ryu, & T. W. Jones SIMULATING ELECTRON TRANSPORT AND SYNCHROTRON EMISSION IN RADIO GALAXIES: SHOCK ACCELERATION AND SYNCHROTRON AGING IN THREE-DIMENSIONAL FLOWS I. L. Tregillis, T. W. Jones, & Dongsu Ryu ERRATUM BeppoSAX OBSERVATIONS OF THE MASER SEYFERT 2 GALAXY ESO 103-G35 Belinda J. Wilkes, Smita Mathur, Fabrizio Fiore, Angelo Antonelli, and Fabrizio Nicastro EKMAN LAYERS AND THE DAMPING OF INERTIAL r-MODES IN A SPHERICAL SHELL: APPLICATION TO NEUTRON STARS Michel Rieutord COSMOLOGICAL EVOLUTION OF LINEAR BIAS S. Basilakos & M. Plionis 2001 AUGUST 20, NUMBER 2 THE VOID PHENOMENON P. J. E. Peebles GALAXY NUMBER COUNTS IN THE HUBBLE DEEP FIELD AS A STRONG CONSTRAINT ON A HIERARCHICAL GALAXY FORMATION MODEL Masahiro Nagashima, Tomonori Totani, Naoteru Gouda, & Yuzuru Yoshii CONSTRAINTS FROM THE Lyaz FOREST POWER SPECTRUM © Matias Zaldarriaga, Lam Hui, & Max Tegmark CHEMICAL ENRICHMENT AT HIGH REDSHIFTS: UNDERSTANDING THE NATURE OF DAMPED Lya SYSTEMS IN HIERARCHICAL MODELS Patricia B. Tissera, Diego G. Lambas, Mirta B. Mosconi, & Sofia Cora STRUCTURE OF DARK MATTER HALOS FROM HIERARCHICAL CLUSTERING Toshiyuki Fukushige & Junichiro Makino A HIGH-RESOLUTION STUDY OF THE HYDRA A CLUSTER WITH CHANDRA: COMPARISON OF THE CORE MASS DISTRIBUTION WITH THEORETICAL PREDICTIONS AND EVIDENCE FOR FEEDBACK IN THE COOLING FLOW L. P. David, P. E. J. Nulsen, B. R.M cNamara, W. Forman, C. Jones, T. Ponman, B. Robertson, & M. Wise ON THE NONTHERMAL EMISSION AND ACCELERATION OF ELECTRONS IN COMA AND OTHER CLUSTERS OF GALAXIES Vaheé Petrosian THE CONTRIBUTION OF POPULATION III TO THE ENRICHMENT AND PREHEATING OF THE INTRACLUSTER MEDIUM Michael Loewenstein WFPC2 IMAGING OF QUASAR ENVIRONMENTS: A COMPARISON OF LARGE BRIGHT QUASAR SURVEY AND HUBBLE SPACE TELESCOPE ARCHIVE QUASARS Rose A. Finn, Chris D. Impey, & Eric J. Hooper B1359+154: A SIX-IMAGE LENS PRODUCED BY A z ~ 1 COMPACT GROUP OF GALAXIES D. Rusin, C. S. Kochanek, M. Norbury, E. E. Falco, C. D. Impey, J. Lehar, B. A. McLeod, H.-W. Rix, C. R. Keeton, J. A. Mufioz, & C. Y. Peng HIGH-REDSHIFT GALAXY OUTFLOWS AND THE FORMATION OF DWARF GALAXIES Evan Scannapieco, Robert J. Thacker, & Marc Davis DEPENDENCE OF HALO PROPERTIES ON INTERACTION HISTORY, ENVIRONMENT, AND COSMOLOGY Jeffrey P. Gardner N-BAND IMAGING OF SEYFERT NUCLEI AND THE MID-INFRARED-X-RAY CORRELATION Alfred Krabbe, Torsten Boker, & Roberto Maiolino CONTENTS MID-INFRARED SPECTRAL ENERGY DISTRIBUTION OF NGC 1068 WITH 071 SPATIAL RESOLUTION Daigo Tomono, Yoshiyuki Doi, Tomonori Usuda, & Tetsuo Nishimura HIGH-LATITUDE H 1 IN NGC 2613: STRUCTURE AND DYNAMICS Tara A. Chaves & Judith A. Irwin VERY LARGE ARRAY OBSERVATIONS OF THE H92a LINE FROM NGC 5253 AND HENIZE 2-10: IONIZED GAS AROUND SUPER STAR CLUSTERS Niruj R. Mohan, K. R. Anartharamaiah, & W. M. Goss THE INTERSTELLAR MEDIUM OF M32 Gary A. Welch & Leslie J. Sage INFLOW OF GAS TO THE SOLAR NEIGHBORHOOD DURING EVOLUTION OF THE GALACTIC DISK E. Casuso & J. E. Beckman MEASUREMENT OF THE COSMIC-RAY ENERGY SPECTRUM AND COMPOSITION FROM 10!” TO 1018-3 eV USING A HYBRID TECHNIQUE T. Abu-Zayyad, K. Belov, D. J. Bird, J. Boyer, Z. Cao, M. Catanese, G. F. Chen, R. W. Clay, C. E. Covault, H. Y. Dai, B. R. Dawson, J. W. Elbert, B. E. Fick, L. F. Fortson, J. W. Fowler, K. G. Gibbs, M. A. K. Glasmacher, K. D. Green, Y. Ho, A. Huang, C. C. Jui, M. J. Kidd, D. B. Kieda, B. C. Knapp, S. Ko, C. G. Larsen, W. Lee, E. C. Loh, E. J. Mannel, J. Matthews, J. N. Matthews, B. J. Newport, D. F. Nitz, R. A. Ong, K. M. Simpson, J. D. Smith, D. Sinclair, P. Sokolsky, P. Sommers, C. Song,J .K . K. Tang, S. B. Thomas, J.C. van der Velde, L. R. Wiencke, C. R. Wilkinson, S. Yoshida, & X. Z. Zhang A STATISTICAL CHARACTERIZATION OF GALACTIC DUST EMISSION AS A NON-GAUSSIAN FOREGROUND OF THE COSMIC MICROWAVE BACKGROUND J. Jewell PREPROTOSTELLAR CORE PROPERTIES FROM FAR-INFRARED OBSERVATIONS W. D. Langer & K. Willacy THE PROBABILITY DISTRIBUTION FUNCTION OF COLUMN DENSITY IN MOLECULAR CLOUDS Enrique Vazquez-Semadeni & Nieves Garcia MOLECULAR DEPLETION AND THERMAL BALANCE IN DARK CLOUD CORES Paul F. Goldsmith CHANDRA OBSERVATION OF THE p OPHIUCHI CLOUD © Kensuke Imanishi, Katsuji Koyama, & Yohko Tsuboi EVIDENCE FOR EXPANDING SUPERBUBBLES IN A GALAXY AT z = 0.7443 Nicholas A. Bond, Christopher W. Churchill, Jane C. Charlton, & Steven S. Vogt SN 1993J VLBI. I. THE CENTER OF THE EXPLOSION AND A LIMIT ON ANISOTROPIC EXPANSION M. F. Bietenholz, N. Bartel, &M . P. Rupen DYNAMICS OF Fe BUBBLES IN YOUNG SUPERNOVA REMNANTS © John M. Blondin, Kazimierz J. Borkowski, & Stephen P. Reynolds DISCOVERY OF TWO NEW PULSATING DA (ZZ CETI) WHITE DWARFS G. Fontaine, P. Bergeron, P. Brassard, M. Billéres, & S. Charpinet GRAINS IN THE ATMOSPHERES OF RED GIANT STARS Jason W. Ferguson, David R. Alexander, France Allard, & Peter H. Hauschildt NUCLEOSYNTHESIS AND MIXING ON THE ASYMPTOTIC GIANT BRANCH. III. PREDICTED AND OBSERVED s-PROCESS ABUNDANCES Maurizio Busso, Roberto Gallino, David L. Lambert, Claudia Travaglio, & Verne V. Smith PHOTOMETRIC VARIABILITY IN THE ULTRACOOL DWARF BRI 0021—0214: POSSIBLE EVIDENCE FOR DUST CLOUDS Eduardo L. Martin, Maria Rosa Zapatero Osorio, & Harry J. Lehto SUBARCSECOND MID-INFRARED STRUCTURE OF THE DUST SHELL AROUND IRAS 22272+ 5435 Toshiya Ueta, Margaret Meixner, Philip M. Hinz, William F. Hoffmann, Wolfgang Brandner, Aditya Dayal, Lynne K. Deutsch, Giovanni G. Fazio, &J oseph L. Hora THE INFRARED CONTINUUM SPECTRUM OF VY CANIS MAJORIS Martin Harwit, Koen Malfait, Leen Decin, Christoffel Waelkens, Helmut Feuchtgruber, & Gary J. Melnick THE SOURCES OF SOLAR ULTRAVIOLET VARIABILITY BETWEEN 2765 AND 2885 A: Mg |, Mg u, Si 1 AND CONTINUUM J. S. Morrill,K . P. Dere, & C. M. Korendyke SUNSPOT BRIGHT RINGS: EVIDENCE FROM CASE STUDIES M. P. Rast, R. W. Meisner, B. W. Lites, P. A. Fox, & O. R. White CONTENTS A MULTIWAVELENGTH STUDY OF THREE SOLAR FLARES M. R. Kundu, A. Nindos, 8. M. White, & V. V. Grechnev WAITING-TIME DISTRIBUTIONS IN LATTICE MODELS OF SOLAR FLARES James P. Norman, Paul Charbonneau, Scott W. McIntosh, & Han-Li Liu POLYTROPIC INDICES OF SOLAR FLARES Howard Garcia THE SUN AS AN X-RAY STAR. III. FLARES F. Reale, G. Peres, & S. Orlando AN EMPIRICAL METHOD TO DETERMINE ELECTRON ENERGY MODIFICATION RATES FROM SPATIALLY RESOLVED HARD X-RAY DATA A. Gordon Emslie, Richard K. Barrett, & John C. Brown EFFECTS OF AN ELECTRICALLY CONDUCTING INNER CORE ON PLANETARY AND STELLAR DYNAMOS Gerald Schubert & Keke Zhang SNAPSHOT IDENTIFICATION OF GAMMA-RAY BURST OPTICAL AFTERGLOWS James E. Rhoads ACCRETION MODELS OF GAMMA-RAY BURSTS Ramesh Narayan, Tsvi Piran, & Pawan Kumar MAGNETIC SCREENING IN ACCRETING NEUTRON STARS Andrew Cumming, Ellen Zweibel, & Lars Bildsten SPECTRA OF MASER RADIATION FROM A TURBULENT, CIRCUMNUCLEAR ACCRETION DISK. III. CIRCULAR POLARIZATION W. D. Watson & D. S. Wiebe CHEMICAL ABUNDANCES OF THE ACCRETING MAGNETIC WHITE DWARF IN THE POLAR AM HERCULIS Joseph DePasquale & Edward M. Sion STANDING SHOCKS AROUND BLACK HOLES: AN ANALYTICAL STUDY Santabrata Das, Indranil Chattopadhyay, & Sandip K. Chakrabarti DUST MIGRATION AND MORPHOLOGY IN OPTICALLY THIN CIRCUMSTELLAR GAS DISKS Taku Takeuchi & Pawel Artymowicz IONIZATION PROPERTIES AND ELEMENTAL ABUNDANCES IN DAMPED Lya SYSTEMS Giovanni Vladilo, Miriam Centurion, Piercarlo Bonifacio, & J. Christopher Howk PRELIMINARY CONSTRAINTS ON !2C(a,7)!°O FROM WHITE DWARF SEISMOLOGY T. S. Metcalfe, D. E. Winget, & P. Charbonneau SELF-SIMILAR EQUILIBRIA OF SELF-GRAVITATING, MAGNETIZED, ROTATING ISOTHERMAL SYSTEMS Mohsen Shadmehri & Jamshid Ghanbari ERRATUM THe MACHO Project: MICROLENSING OPTICAL DEPTH TOWARD THE GALACTIC BULGE FROM DIFFERENCE IMAGE ANALYSIS C. Alcock, R. A. Allsman, D. R. Alves, T. S. Axelrod, A. C. Becker, D. P. Bennett, K. H. Cook, A. J. Drake, K. C. Freeman, M. Geha, K. Griest, M. J. Lehner, S. L. Marshall, D. Minniti, C. A. Nelson, B. A. Peterson, P. Popowski, M. R. Pratt, P. J. Quinn, C. W. Stubbs, W. Sutherland, A. B. Tomaney, T. Vandehei, and ‘D. L. Welch we tg y